"No? That may be the greatest suggestion I've heard yet."
"The goblins had one of the stones which fit into these slots. I saw it's shape in their packs as they left. By my count, we have three of the stones here, and we know who carries the fourth. Wherefore could lead us to the fifth? I loath to admit it, but those creatures of darkness have at least one of the keys, and more knowledge on this place than we do. We have already buried the hatchet with the goblins - perhaps now is the time to come with them with an offering of..." Gerald makes a disgusted face before proceeding, "...peace."
An awkward silence hangs in the air. "No, really. We can come to them under the guise of seeking passage to the nearest town for supplies, and will pay handsomly for supplies. This will bring us closer to the next stone, and if luck favors us and the sun smiles upon our mission, they will know where we can find the next stone. Or perhaps they can tell us what they might know about this place and its purpose. I assure you that I despise working together with such filth more than any among us, but if this is what must be done to fulfill my contract, I shall honor our agreements."
Are there any spare shields or one-handed weapons lying around all the goblin corpses? My AC's high, but I suppose it could always be higher if I'm willing to switch over to a straight-sword or an axe. I'm totally still gonna carry around a longsword for when I need it.